How To Replace the Master Cylinder Sight Glass on a Motorcycle or ATV

Tusk Replacement Brake Master Cylinder Sight Glass

If your machine has a leaking or cloudy master cylinder sight glass, just replacing the glass is any easy and cheap way to get it refreshed without having to get a whole new master cylinder. In this video Charles shows how to replace a master cylinder sight glass using the Tusk Replacement Brake Master Cylinder Sight Glass. This process will be similar for all motorcycles, ATVs and other powersports.

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[ThreenaddiesRexMegistus]

Just did these in place and without the need to bleed. Levelled the reservoir, drained to below the window with a veterinary syringe and the rest exactly as you did. The replacements are cheap and the same as the polycarbonate originals that have been there since 2007 - just starting to crack. I did use a tool to hold the clutch lever under pressure, but I’m not convinced this is necessary. 👍🏻

[jonnythefirsty]

Thanks for this. I did it on the bike (carefully) used a punch to carefully tap out the rings and used vise grip and a brass washer to press the glass back in. Sorted ❤

[MasoN]

Didn't even realize these could be replaced! I'll definitely be doing this on my '93 TRX300

[chaunceywright]

Thanks so much cuz without you telling me the name of the glass I would never got my back brakes fixed but now I'm riding the Harley Davidson 120th anniversary I'll be able to make it thanks to you thanks again

[stephenpatrick]

13 mm socket used to press in it appeared; I bought a pair of 18 mm glass lenses from Rocky Mountain & hope to install while afixed to the handlebars - I have "vice clamps" and will WD-40 the outer rim before installation prior to install. Don't want to crack the 🥂 got to go slow. Thank you so much Rocky Mountain !!

[starshipman]

Awesome help much appreciated, fixing my Harley

[ethanh]

Sure does beat replacing the whole master cylinder

[nissanlevi]

Is it the same process for replacing the REAR master cylinder sight glass ? (a Brembo one)

[sebastiandiluise]

Hi, great video! hey... have any experience with a Honda VT700 1986? from what I see the parts manual there is no spare parts or o-ring, seems just glued some way.

[Oneguygarage]

Thanks so much. How do I know if is for the one I need? Or all all standard? I need a 1985 Yamaha VMAX. Regards

[bilboswaggens]

I didn't even know this was a thing lol

[jakelencher]

How do you get the thing to go in straight, messed up 2 of them cause it wont go in straight

[Luggruff]

Question: I have this type of reservoir on my transalp. Are these specific to specific bikes, or can I completely replace it with a transparent cylinder type?

[jodylarue]

Have you done this with brembo? Do you know if those tusk ones will fit in the brembo master cylinders brembo doesn’t seem to sell one directly

[algamei]

I have proplam in my bike Harley fatboy 114 The Dealer of harley in dubai they are seying You must replace all that means i will Go buy new one kit assembly you can not change class what you think?

[khillajuggalette]

How do you remove the brake cable from the master cylinder reservoir itself? I'm trying to remove mine off of my bike so I can properly clean all of it but I can't get the cable separate from the reservoir if anybody knows how please let me know

[vegmoto]

Do you absolutely have to take it off the bike? Is there any reason why you couldn’t just do this on the bike? My sight glass popped out on its own and I lost my front brake on a ride.

[linkmasters]

This is what gets me it says sight glass for the brake and clutch master cylinder but they are not glass they are some stupid plastic ones that go bad in the sun or summer tell me why they don’t have real glass ones I bought a pair of them for my friends 1990 Honda Goldwing SE 1500 and with in a couple of months later they crumble into nothing and pieces and they are still going up in price quickly so I paid 8 to 9 bucks for two then I checked on them for his bike again and they are 28 bucks for two of them if they were real glass and are very careful when putting them in they would last a lot longer than cheap plastic ones